Siemens Industrial Controls 3RH2921-1DA20 Switch 320788-704 Optimized defrost cycle timing prevents

Optimized defrost cycle timing prevents unnecessary energy consumption while maintaining outdoor coil integrity

ensuring a precise fit without requiring field modifications

maintaining the original equipment’s logic for flame sensing and limit switch monitoring

Key Benefits: Enhanced System Logic: Provides dual-state feedback (1NO/1NC) for precise control circuit management

Siemens Industrial Controls 3RH2921-1DA20 Switch 320788-704 Optimized defrost cycle timing preventsThe Siemens SIRIUS 3RH2921 1DA20 is a high performance lateral auxiliary switch designed specifically for side mounting on size S0 and S2 contactors. This 2 pole block features a 2NO (Normally Open) contact configuration, providing reliable signaling and control circuit expansion for 3RT2 power contactors and 3RH2 contactor relays. Engineered for heavy duty industrial and HVACR environments, the 3RH2921 1DA20 utilizes secure screw terminals to ensure